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1.
GTIP Giggling Till I Pee
That is so funny it made me GTIP.
by texasbratt99 August 31, 2010
 
2.
Something you can swear on that shows how serious one is. Also used as G for short. Shows truth in a statement.
"On the G Tip he told me that you ran up in my girl"
by Michael j. Morales September 20, 2005